Modular Shipping Container

ABSTRACT

The present invention discloses a modular shipping container, which includes a box assembled by a front door, a rear plate, a top plate, a bottom plate and two side plates. In the modular shipping container, jacket and screw holes are provided at portions where the front door and the rear plate are connected to the side plates, so as to implement detachable connection and easy assembly of the box. In addition, in the modular shipping container, traction devices capable of being assembled are horizontally provided at the sides of the box, so that the loading and unloading operations of an operator are simplified. Meanwhile, in the modular shipping container, a lock having an inward opening function is adopted, thereby guaranteeing the safety of an operator and a cargo.

BACKGROUND

1. Technical Field

The present invention relates to a modular shipping container.

2. Related Art

A shipping container is a large cargo container that is properly strongand rigid, meets a certain specification, and is used fortransportation. In the transfer of a cargo using a shipping container,the cargo can be directly loaded at a consigner's warehouse, transportedto a consignee's warehouse and unloaded, and in the midway, when thevehicle and ship is changed, the cargo does not need to be taken outfrom the shipping container and reloaded.

A conventional shipping container should be a steel box that is steadilywelded into a fixed shape and cannot be detached or assembled.Therefore, a large space is occupied during the transportation in anunloaded state, which results in a great waste to the operating cost.

SUMMARY

The technical problem to be solved by the present invention is toprovide a modular shipping container capable of being convenientlyassembled.

To implement the above inventive object, one solution for implementingthe modular shipping container provided in the present inventionincludes a box assembled by a front door, a rear plate, a top plate, abottom plate and two side plates. The outer sides of portions where thefront door and the rear plate are connected to the two side plates arecovered with jackets. At least two screw holes are opened in the jacketin the vertical direction. Screw holes or openings are opened atpositions, corresponding to the screw holes, on the front door, the rearplate, and the two side plates, respectively. The front door and therear plate are detachably connected to the two side plates by thejackets through the screw holes or the openings.

As one preferred embodiment of the above modular shipping container, inthe modular shipping container, the end portions, used to be connectedto the side plates, of the front door and the rear plate fold inwardlyto form flanges, and the screw holes are opened on the flanges.

As another preferred embodiment of the modular shipping container, themodular shipping container further includes a traction device to be usedin combination with the box. The traction device includes a tractionconnector and a traction wheel. One traction connector hole and twotraction wheel holes are opened horizontally on front and rear sides ofthe bottom plate, respectively. The traction connector hole is used toconnect the traction connector and the box. The traction wheel hole isused to connect the traction wheel and the box. Also, the two tractionwheel holes are symmetrically distributed at two sides of the tractionconnector hole.

As yet another preferred embodiment of the above modular shippingcontainer, in the modular shipping container, the box is installed witha lock having an inward opening function.

The present invention discloses another solution for implementing themodular shipping container, which includes a box, and further includes atraction device to be used in combination with the box, and the tractiondevice includes a traction connector and a traction wheel.

One traction connector hole and two traction wheel holes arehorizontally opened on both of the two opposite sides of the bottom ofthe box, respectively. The traction connector hole is used to connectthe traction connector and the box. The traction wheel hole is used toconnect the traction wheel and the box. Also, the two traction wheelholes are symmetrically distributed at two sides of the tractionconnector hole.

The present invention further discloses further a solution forimplementing the modular shipping container, which includes a box, andthe box is installed with a lock having an inward opening function.

The lock includes a lock rod, a lock case handle connected to the lockrod, and a lock case base fixed on the door. The lock case handle isreceived inside the lock case base.

A movable bolt and a pushing rod mechanism are provided inside the lockcase base. The movable bolt includes a bolt cam, a bolt base, a bolt pinand a spring. The pushing rod mechanism includes a pushing rod used topush the bolt cam to rotate and a mechanism used to push the pushing rodto move.

The bolt cam has an extension leg used to be connected to the pushingrod and a hook used to prevent the lock case handle from being opened.The extension leg of the bolt cam is connected to the pushing rod. Thebolt cam has a through hole in the center. The bolt pin passes throughthe through hole of the bolt cam and the spring, and is fixed on thebolt base. One end of the spring is placed on the extension leg of thebolt cam, and the other end is positioned on the lock case base.

In the modular shipping container provided in the present invention,jackets and screw holes are provided at the portions where a front doorand a rear plate are connected to side plates, so that detachableconnection and easy assembly of a box are implemented. For the modularshipping container, traction devices capable of being assembled arehorizontally provided at the sides of the box, so that the loading andunloading operations of an operator are simplified. Meanwhile, in themodular shipping container, a lock having an inward opening function isadopted, thereby guaranteeing the safety of an operator and a cargo.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure will become more fully understood from thedetailed description given herein below for illustration only, and thusare not imitative of the present disclosure, and wherein:

FIG. 1 is a three-dimensional schematic structural view of a modularshipping container according to an embodiment;

FIG. 2 is a schematic structural exploded view of the modular shippingcontainer in FIG. 1, with the top plate and the bottom plate removed;

FIG. 3 is a schematic view of the modular shipping container in FIG. 1in an assembled state, with the top plate and bottom plate removed;

FIG. 4 is a top view of the modular shipping container in FIG. 3;

FIG. 5 is a schematic structural view of the bottom plate in the modularshipping container in FIG. 1;

FIG. 6 is a schematic view of a traction device in an assembled state ofa modular shipping container according to an embodiment;

FIG. 7 is an enlarged view of a portion A in FIG. 6;

FIG. 8 is a right view of the modular shipping container in FIG. 1;

FIG. 9 is a rear view of the modular shipping container in FIG. 1;

FIG. 10 is a schematic structural exploded view of a traction connectorof a modular shipping container according to an embodiment;

FIG. 11 is a schematic structural view of a traction wheel of a modularshipping container according to an embodiment;

FIG. 12A is a schematic front view of a lock having an inward openingfunction of a modular shipping container according to an embodiment;

FIG. 12B is a schematic right view of the lock in FIG. 12A;

FIG. 13 is a schematic front view of a lock case base part of the lockin FIG. 12A;

FIG. 14 is an enlarged view of a portion I in FIG. 12A; and

FIG. 15 is a sectional view along B-B in FIG. 14.

DETAILED DESCRIPTION

The technical content of the present invention is illustrated in detailbelow with reference to the accompanying drawings and specificembodiments.

At some places, conventional shipping containers are gradually replacedby shipping containers capable of being assembled. These shippingcontainers capable of assembled are usually formed of six movableplates, which are assembled and fixed through movable connectionstructures in loading a cargo and are detached, folded, and stored in anunloaded state, thereby saving the storage space and facilitatingtransportation.

In one embodiment in FIG. 1, the modular shipping container provided bythe present invention is mainly formed of independent plates such as abottom plate 1, two side plates 2, a front door 3, a rear plate 4, and atop plate 5. The plates can be fabricated of metal materials such assteel plates, sheet iron, and aluminum alloy. The front door 3, the sideplates 2, the rear plate 4 are vertically placed on the bottom plate 1and are covered by the top plate S to form a box 10.

As can be seen by combining FIG. 2, FIG. 3 and. FIG. 4, L-shaped jacketscover the outer sides of portions where the front door 3 and the rearplate 4 are connected to the two side plates 2. In an embodiment of themodular shipping container, the jacket is preferably implemented byangle iron 6. Two screw holes are opened on the angle iron 6 in thevertical direction, and screw holes or openings are opened on the frontdoor 3, the rear plate 4, and the side plates 2 at positionscorresponding to the screw holes on the angle iron 6, respectively (seethe schematic structural exploded view in FIG. 2). A screw boltsequentially passes through the screw holes or openings on the angleiron 6, the side plates 2 and the front door 3 or the rear plate 4, anda nut is installed at the end portion of the screw bolt, so that thefront door and the rear plate are detachably connected to the two sideplates. To enhance the connection strength between the angle iron 6 andthe box 10 and guarantee the waterproof effect of the box, the angleiron 6 and the box 10 can be bonded using waterproof glues.Specifically, the angle iron 6 is formed by two lateral edgesperpendicular to each other, and the two lateral edges are bonded onouter walls of the side plates 2 and the front door 3 or the rear plate4, respectively.

To enhance the rigidity of the box 10 and guarantee the safety of thethreaded connection, rib structures used to increase the rigidity areadded at the end portions for connection of the side plates 2, the frontdoor 3 and the rear plate 4. For example, as shown in FIG. 2, the endportion, used to be connected to the side plate 2, of the front door 3,folds inwardly to form a flange, and a screw hole (or opening) is openedon the flange.

The end portion, used to be connected to the side plate 2, of the rearplate 4 has a connection block, and a screw hole (or opening) is openedon the connection block. Also, the end portions, used to be connected tothe front door 3 and the rear plate 4, of the side plates 2 also haveconnection blocks, and screw holes are opened on the connection blocks.Referring to the schematic view of an assembled state in FIG. 4, a screwbolt 6A passes, from the outer side of the box 10, through the screwholes on the connection blocks of the angle iron 6 and the side plates2, on the flange of the front door 3 or on the connection block of therear plate 4, and enters the box, and a nut is installed on the endportion of the screw bolt 6A, so that the side plates 2 are securelyconnected to the front door 3 and the rear plate 4. In an unloadedstate, the screw bolt 6A and the nut are removed to dismantle the box10.

The side plates 2, the front door 3, and the rear plate 4 may beconnected to the bottom plate 1 in a pivotal connection manner also in aclamped connection manner. In an unloaded state, the side plates 2, thefront door 3, and the rear plate 4 can fold inwardly to form amulti-layered integral structure for storage, or also multiple movableplates separate from each other may be stored separately, thereby savingthe operating cost. The top plate 5 includes a plurality of sealingplates welded to each other on a keel. The contacts between the topplate 5 and the front door 3, the rear plate 4, and the side plates 2are provided with flanges extending downwardly, so as to achieve thewaterproof object when the top plate 5 closes on the box 10. In theabove structure, the side plates 2 are connected to the front door 3 andthe rear plate 4 through the angle iron 6 and screw holes, and thenumber of screw holes opened on a single piece of angle iron 6 is notlimited and can change with the height of the box 10. For example, morethan two screw holes are opened in the vertical direction. In the aboveembodiment, the two lateral edges of the angle iron 6 are bonded to theside plates 2 and the front door 3 or the rear plate 4, respectively. Ascrew hole is opened on one lateral edge of the angle iron 6, and theside plate 2 is connected to the front door 3 or the rear plate 4through a single screw bolt. Also, a screw hole can be opened on the twolateral edges of the angle iron 6, respectively, and the angle iron 6 isconnected to the side plates 2, or the angle iron 6 is connected to thefront door 3 or the rear plate 4, through different screw holes,respectively. In the above structure, the structure of the screw boltcan be replaced by a threaded bolt, and the like, and the step ofbonding the angle iron 6 and the box can also be omitted.

To achieve the waterproof object, in an embodiment of the modularshipping container, the area of the top plate 5 is greater than the areaof the bottom plate 1. The bottom plate 1 includes a base plate 1 a anda bottom frame 1 b. The height of the base plate 1 a is greater than theheight of the bottom frame 1 b (see FIG. 5). Meanwhile, the positionswhere the front door 3, the rear plate 4 and the side plates 2 arecontacted to the bottom plate 1 can be welded with side covers,respectively, so as to guarantee that water is unable to enter the box10 when flowing from upper layers. An adhesive strip is inserted at theinner frame of the front door 3 of the box. When the door is locked, thedoor plate tightly presses the adhesive strip and water is unable toenter the box. As shown in FIG. 5, antislip unsmooth patterns areprovided on the base plate 1 a of the bottom plate 1 to prevent a loadedcargo from slipping inside the box 10.

In an embodiment of the modular shipping container, a traction deviceused to implement tractive loading and unloading is further included. Byinstalling the traction device capable of being assembled, incombination with a towing device (for example, an elevator and awindlass), the tractive loading and unloading of the shipping containercan be implemented. During the loading and unloading, large suspensionequipment is not required and the operations become easy.

As can be seen by combining FIG. 1, FIG. 5 and FIG. 11, the modularshipping container includes a box 10 and a traction device to be used incombination with the box 10. The traction device includes a tractionconnector 21 (see FIG. 10) and a traction wheel 22 (see FIG. 11). Asshown in FIG. 5, one traction connector hole 7 and two traction wheelholes 9 are horizontally opened on front and rear sides of the bottomframe 1 b of the box 10, respectively. The two traction wheel holes 9are symmetrically distributed at two sides of the traction connectorhole 7. As shown in FIG. 6 and FIG. 7, during the loading and unloadingof the shipping container, the traction connector 21 and the tractionwheel 22 are inserted in the corresponding traction connector hole 7 andthe traction wheel hole 9. When fixed, through the towing deviceconnected to the traction connector 21, the shipping container can bedragged to move forward and backward. In addition, see FIG. 5 and FIG.8, a plurality of forklift holes 8 used for the operation by a forklifttruck can be further provided at the left and right sides of the bottomframe 1 b.

As shown in FIG. 10, the traction connector 21 includes a tubularconnecting body and a fitting fastener thereof. The traction connector21 is connected to the box 10 by inserting the connecting body insidethe traction connector hole 7 and using the fastener for fixation. Inthe embodiment, a hollow square through pipe is used as the connectingbody and a screw bolt is used as the fastener. Of course, other partscan also be used as the connecting body and the fastener. For example,flat iron is used as the connecting body. Correspondingly, the tractionconnector hole 7 opened on the bottom frame 1 b can be designed into asquare insertion hole or flat iron insertion hole.

As shown in FIG. 11, the traction wheel 22 includes an insertion stem 22a, a central shaft 22 b and rollers 22 c. One end of the insertion stem22 a is fixed in the middle of the central shaft 22 b. The two rollers22 c are installed at the two ends of the central shaft 22 b,respectively. The insertion stem 22 a corresponds to the traction wheelhole 9 in shape and size. One end, away from the central shaft 22 b, ofthe insertion stem 22 a is inserted in the traction wheel hole 9 and istightened using a screw bolt to implement the connection between thetraction wheel 22 and the box 10. During the movement of the shippingcontainer, the rollers 22 c rotate about the central shaft 22 b.

When the modular shipping container is loaded on a truck, the tractionwheel 22 and the traction connector 21 are first installed on the box10, and next through the towing device connected at the other end of thetraction connector 21, the loading and unloading of the shippingcontainer are implemented.

Specifically, the traction connector 21 is inserted in the tractionconnector hole 7 and is locked tight using the screw bolt to preventfalling. The retractable support on the truck is unfolded, the hook onthe wire rope is then hung on the traction connector 21, and thewindlass is started to lift one end of the shipping container using thewire rope. Two pairs of traction wheel 22 are inserted inside thetraction wheel holes 9 on the bottom frame 1 b, respectively, so thatthe front end of the box has two pairs of traction wheel. Two steelpipes are placed on the ground in the middle of the box, and the otherend, that is not provided with traction wheels, of the box 10 is liftedusing the level principle, and then two pairs of traction. wheel 22 areinserted in the traction wheel holes 9 of the bottom frame 1 b throughthe insertion stems 22 a. After four pairs of traction wheel 22 areinstalled, the two steel pipes are removed, and at this time the fourpairs of traction wheel 22 are fixed through the weight of the box 10.To prevent the traction wheels 22 from falling off, screw bolts need tobe installed for fixation. Next, the carriage of the truck slides offtwo the ground, and the windlass is started to pull the shippingcontainer on the carriage through the wire rope and fix the shippingcontainer.

The process of unloading the box 10 is the reverse operation of theabove process. Through the weight of the box 10 and under the pullingforce of the windlass, the box 10 slowly slides to the ground throughthe traction wheels 22. Through the lift of the suspension hook and thesteel pipes, the four pairs of traction wheels 22 are dismounted usingthe level principle, respectively, so that the box 10 is stably placedon the ground.

In the whole loading and unloading process, the traction wheels 22 areloaded and unloaded using the level principle, and the box 10 is draggedthrough the traction connector 21 to move for loading and unloading ofthe truck, which is an labor-saving loading and unloading manner andrequires to use low power towing equipment, and the work can beaccomplished with small equipment. The elevator or windlass can becompletely integrated on the truck, and one driver alone can completethe whole operation of loading the box and unloading the box throughsimple and labor-saving connection members and stepwise operations, andthe process is safe, simple, and easy.

The traction connector hole 7 and the traction wheel hole 9 arehorizontally provided to implement the installation of the tractionconnector 21 and the traction wheels 22 on the sides of the box 10 ofthe shipping container, so as to reduce the lift height during theprocess of installing the traction device. In the process of installingthe traction wheels 22, the lift height of the box 10 only needs toreach the height equal to the radius of the roller 22 c, and the loadingand unloading are convenient, clear, stable and have a desirableoperation space.

In the process of loading and unloading the shipping container, thetraction connector 21 and the traction wheels 22 are install on thesides of the box 10, and the direction in which the traction wheel hole9 and the traction connector hole 7 are opened is parallel to thedirection of the bottom plate 1 (horizontally provided). For the box 10,the four traction wheel holes 9 bear the force and directly carry theweight of the box 10. The traction connector 21 is inserted in thetraction connector hole 7, and the traction connector hole 7 directlycarries the suspension force and the towing force on the box 10.Meanwhile, the traction device is fixed on the box 10 through tightlocking using screw bolts, so as to guarantee that the traction devicedoes not fall off in the whole traction process.

In addition, to guarantee safe use of a shipping container, in anembodiment of the modular shipping container, a lock having an inwardopening function is further installed. The lock includes a lock rod 11,a lock case handle 14 connected to the lock rod 11, and a lock case base15 fixed on the front door 3. The lock case handle 14 can be receivedinside the lock case base 15. A movable bolt 15 c and a pushing rodmechanism are provided inside the lock case base 15. The pushing rodmechanism can push the movable bolt 15 c to rotate to actuate the lockrod 11 to rotate, so as to implement the inward opening of the lock.

Specifically, as shown in FIG. 12A and FIG. 12B, the lock includes alock rod 11, cylinders 12, lock bases 13, a lock case handle 14, a lockcase base 15, lock rod brackets 16 and a lock rod fixing base 17. Thelock case base 15 is fixed on the door plate of the box of the shippingcontainer. The lock case handle 14 can be received inside the lock casebase 15. The middle of the lock rod 11 passes through the lock rodfixing base 17 fixed on the lock case base 15, and is fixedly connectedto the lock case handle 14. The upper and lower ends of the lock rod 11pass through the lock rod brackets 16 provided at the positions near thesides of the door plate, respectively, and connected to the upper andlower cylinders 12. One lock base 13 corresponding to the upper andlower cylinders 12 is provided at the upper end and the lower end in themiddle of the outer door frame, respectively. In the lock, the lock rod11 is controlled through the lock case handle 14 to actuate the cylinder12 and the lock base 13 to be combined or released, so as to close oropen the door of the box of the shipping container.

As shown in FIG. 15, in the embodiment, the cylinder 12 has a hook shapeand is fixed to the lock rod 11 at a fixed angle. The lock base 13 has arectangular box shape. A semicircular fixing pin used to be combinedwith the cylinder 12 is provided inside the lock base 13. The lock rod11 rotates to actuate the cylinder 12 to rotate, so that the cylinder 12is combined with or released from the semicircular fixing pin fixedinside the lock base 13. In the process of locking the door, the lockcase handle 14 rotates to actuate the lock rod 11 rotate, so that thecylinder 12 rotates inside the lock base 13 and locks the door tight incombination with the semicircular fixing pin. The lock base 13, thecylinder 12, the lock rod 11, and the lock case handle 14 are in aposition relationship of combining with each other. The angle of swingof the cylinder 12, the lock base 13 and the lock case handle 14relative to the lock rod 11 is the size of fitting.

As can be seen by combining FIG. 13 and FIG. 14, in the embodiment, boththe lock case base 15 and the lock case handle 14 are rectangular. Thesize of the lock case handle 14 is smaller than the size of the lockcase base 15 and can be received inside the lock ease base 15. The lockcase base 15 includes a case 15 a, and a fixing bolt 15 b, a movablebolt 15 c and a pushing rod mechanism provided inside the case 15 a. Tworectangular holes fitting the sizes of the bolts 15 b and 15 c areprovided on the lock case handle 14. When the lock case handle 14 isnear the lock case base 15, the two bolts 15 b and 15 c on the lock casebase 15 pass through the fitting rectangular holes thereof on the lockcase handle 14. The fixing bolt 15 b is used to lock the door of the boxin combination with other additional door locks. When the door of thebox is temporarily closed, the fixing bolt 15 b does not exert alimiting function. For the movable bolt 15 c, under the force of thespring 15 g, the hook of the bolt cam 15 d thereof presses the edge ofthe rectangular hole of the lock case handle 14 to prevent the openingoutward. The movable bolt 15 c can also completely lock, in combinationwith additional door locks, the door of the box.

As can be seen from FIG. 13, the movable bolt 15 c is formed by a boltcam 15 d, a bolt base 15 e, a bolt pin 15 f and a spring 15 g. Thepushing rod mechanism includes a pushing rod 15 h used to push the boltcam 15 d to rotate, and other device used to push the pushing rod 15 hto move and position the pushing rod 15 h, such as, a handle, a knob ora handwheel provided at the inner side of the door plate, a guidingshaft sleeve, and a nut at a shaft end.

In the movable bolt 15 c, the bolt cam 15 d has a through hole in thecenter. Also, the bolt cam 15 d has an extension leg used to beconnected to the pushing rod 15 h and a hook used to prevent the lockcase handle 14 from being opened. The bolt pin 15 f passes through thespring 15 g and the through hole of the bolt cam 15 d, and is fixed onthe bolt base 15 e through a nut. One end of the spring 15 g is placedat a position where the extension leg of the bolt cam 15 d is clamped atthe spring 15 g, and the other end is positioned on the lock case base15, so that the bolt cam 15 d is subject to a force towards the fixingbolt 15 b (referring to the clockwise direction in FIG. 15). The boltcam 15 d is connected to one end of the pushing rod 15 h. The rotateposition of the bolt cam 15 d is limited by the pushing rod 15 hconnected thereto. The pushing rod 15 h can push the bolt cam 15 d torotate in the direction away from the fixing bolt 15 b (that is, thecounterclockwise direction in FIG. 15). Under the effect of the spring15 g, when the pushing force of the pushing rod 15 h is removed, thepushing rod 15 h and the bolt cam 15 d can return to the initialpositions.

As shown in FIG. 14, the lock case handle 14 is formed of a tube cover14 a, a central panel 14 b and a lateral handle 14 c. The three partsare fixed together. The tube cover 14 a is provided with a round hole.The lock rod 11 is fixedly connected to the lock case handle 14 throughthe tube cover 14 a. The central panel 14 b is concave, on whichrectangular holes fitting the sizes of the fixing bolt 15 b and themovable bolt 15 c are opened, and a concave structure intersecting withthe rectangular holes in a cross-like manner is provided. When the lockis closed, the fixing bolt 15 b and the movable bolt 15 c extend fromthe above two rectangular holes respectively. The concave structure onthe central panel 14 b makes it easy to add other locks to lock thedoor.

The principle of implementing the lock is illustrated below withreference to FIG. 15.

When the door of the box needs to be closed temporarily, the lock casehandle 14 approaches the lock case base 15, so that the two bolts 15 band 15 c pass through the fitting rectangular through holes thereof. Thehook on the bolt cam 15 d can be hooked to the edges of the fittingrectangular through hole thereof on the lock case handle 14. The lockcase handle 14 cannot be opened outward, and the lock of the shippingcontainer is in a closed state. In such a state, to open the lock of theshipping container, the bolt cam 15 d can be turned from outside torelease the hook thereon, the lock case handle 14 is pulled outward, andthe fitting between the cylinder 12 and the lock base 13 is released, sothat the door of the box of the shipping container is opened.Alternatively, the pushing rod 15 h connected to the bolt cam 15 d ispushed from inside the box of the shipping container, so that the boltcam 15 d rotates, the hook thereon is then released from the edge of thefitting the lock case handle 14, the bolt cam 15 d continues to rotate,the extension leg thereon and the pushing rod 15 h push outward the lockcase handle 14, and then the fitting between the cylinder 12 and thelock base 13 is released, so that the door of the box is opened.Therefore, an inward opening function can be implemented for the lock,so as to avoid the cases that a user is locked inside the shippingcontainer. If necessary, a foldable handle 18 can be further providedinside the shipping container (referring to FIG. 12B), so that the doorcan be opened more reliably.

In one embodiment of the present invention, a handle connected to thepushing rod 15 h is provided inside the box. By pushing the handle, thepushing rod 15 h pushes the bolt cam 15 d to rotate, so as to implementthe inward opening of the lock of the shipping container. Of course,other devices used to push the bolt cam 15 d to rotate can also be usedto implement the inward opening of the lock of the shipping container.For example, a pushing rod 15 h having an external screw thread and ahandwheel or knob connected to the pushing rod 15 h can be used forimplementation. A shaft sleeve with an internal screw thread (or canalso be directly one welded nut) is fixed on the lock case base 15. Thepushing rod 15 h passes through the shaft sleeve and is connected to aknob or handwheel provided inside the box. By rotating the knob orhandwheel, the pushing rod 15 h is actuated to rotate along the internalscrew thread of the shaft sleeve, and at the same time, the pushing rod15 h moves forward along the shaft sleeve to push the bolt cam 15 d torotate, so that the hook of the bolt cam 15 d is released from the lockcase handle 14. The bolt cam 15 d continues to rotate and the bolt cam15 d pushes outward the lock case handle 14, and the cylinder 12 and thelock base 13 are released, so that the door is opened from inside. Afterthe door is opened, the handwheel or knob can be rotated to restore theposition of the pushing rod 15 h and the bolt cam.

For the above lock having an inward opening function, the lock casehandle presses the lock case base, and the hook of the bolt cam in themovable bolt clamps the edges of the rectangular holes of the lock casehandle, so that the door of the box can be temporarily closed. At thistime, the door of the box can only be opened by turning the bolt camfrom outside the box to release the hook, which is safer and morereliable. For the inward opening of the lock can be implemented simplyby pushing or rotating a mechanism that is provided at the inner side ofthe door plate and used to push the pushing rod to move. The lock has asimple and proper structure, a reliable mechanism, a simple andconvenient operation, and is suitable for use in a shipping containerfor which the door requires to be temporarily closed or the door need tobe frequently opened and closed, thereby guaranteeing the safety of anoperator and a cargo.

In conclusion, in the modular shipping container provided in the presentinvention, jackets and screw hole and screw holes are provided atportions where the front door and the rear plate are connected to theside plates, so as to implement detachable connection and easy assemblyof the box, and simplify the assembly process of the box.

A traction device capable of being assembled is used in the modularshipping container, traction wheels are loaded and unloaded using thelevel principle, a shipping container with traction wheels is draggedthrough a slope, and a box is loaded on or unloaded from a truck, so asto accomplish the loading and unloading work. In the process of loadingand unloading of the truck, as the traction wheel holes are horizontallyprovided, in the process of installation, the lift height of the box issmall, less labor is required (one person can accomplish the operation),and the loading and unloading equipment is simple and has low power.Compared with the shipping containers in the prior art, the efficiencyof loading and unloading is significantly enhanced.

At the same time, the modular shipping container further uses a lockhaving an inward opening function, thereby significantly guarantee theoperation safety of a user of the shipping container and the cargosafety. The lock case handle presses the lock case base, and the hook ofthe bolt cam in the movable bolt clamps the edges of the rectangularholes of the lock case handle, so as to temporarily close the door ofthe box. At this time, the door of the box can only be opened by turningthe bolt cam from outside the box to release the hook thereof, which issafer and more reliable. The inward opening of the lock can beimplemented simply by pushing or rotating a mechanism provided at theinner side of the door plate and used to push the pushing rod to move.The lock has a simple and proper structure, a reliable mechanism, and asimple and convenient operation.

The modular shipping container provided in the present invention isillustrated in detail above. Any obvious change made by a person ofordinary skill in the art without departing from the actual spirit ofthe present invention will commit an infringement on the patent right ofthe present invention and will be subject to corresponding legalliabilities.

What is claimed is:
 1. A modular shipping container, comprising a boxassembled by a front door, a rear plate, a top plate, a bottom plate andtwo side plates, wherein: jackets are covered at outer sides of portionswhere the front door and the rear plate are connected to the two sideplates, at least two screw holes are opened on the jackets in thevertical direction, screw holes or openings are opened on the frontdoor, the rear plate, and the two side plates at positions correspondingto the screw holes, respectively, and the front door and the rear plateare detachably connected to the two side plates by the jackets throughthe screw holes or the openings.
 2. The modular shipping containeraccording to claim 1, wherein: end portions, used to be connected to theside plates, of the front door and the rear plate fold inwardly to formflanges, and the screw holes are opened on the flanges.
 3. The modularshipping container according to claim 1, wherein: end portions, used tobe connected to the side plates, of the front door and the rear plate,have connection blocks, and the screw holes are opened on the connectionblocks.
 4. The modular shipping container according to claim 1, wherein:end portions, used to be connected to the front door and the rear plate,of the side plates, have connection blocks, and the screw holes areopened on the connection blocks.
 5. The modular shipping containeraccording to claim 1, wherein: the jacket is formed by two lateral edgesperpendicular to each other, and the two lateral edges are bonded onouter walls of the side plates and the front door or the rear plate,respectively.
 6. The modular shipping container according to claim 5,further comprising a traction device to be used in combination with thebox, wherein the traction device comprises a traction connector and atraction wheel; one traction connector hole and two traction wheel holesare opened horizontally on front and rear sides of the bottom plate,respectively, the traction connector hole is used to connect thetraction connector and the box, the traction wheel hole is used toconnect the traction wheel and the box, and the two traction wheel holesare symmetrically distributed at two sides of the traction connectorhole.
 7. The modular shipping container according to claim 6, wherein:the traction connector comprises a tubular connecting body and a fittingfastener thereof; the traction wheel comprises an insertion stem, acentral shaft and rollers, one end of the insertion stem is fixed in themiddle of the central shaft, and two ends of the central shaft areinstalled on the rollers, respectively.
 8. The modular shippingcontainer according to claim 5, wherein: the box is installed with alock having an inward opening function; the lock comprises a lock rod, alock case handle connected to the lock rod, and a lock case base fixedon the door; the lock case handle is received inside the lock case base;a movable bolt and a pushing rod mechanism are provided inside the lockcase base, the movable bolt comprises a bolt cam, a bolt base, a boltpin and a spring, the pushing rod mechanism comprises a pushing rod usedto push the bolt cam to rotate and a mechanism used to push the pushingrod to move; the bolt cam has an extension leg used to be connected tothe pushing rod and a hook used to prevent the lock case handle frombeing opened; the extension leg of the bolt cam is connected to thepushing rod, the bolt cam has a through hole in the center, the bolt pinpasses through the through hole of the bolt cam and the spring, and isfixed on the bolt base; one end of the spring is placed on the extensionleg of the bolt cam, and the other end is positioned on the lock casebase.
 9. A modular shipping container, comprising a box, and furthercomprising a traction device to be used in combination with the box,wherein the traction device comprises a traction connector and atraction wheel; one traction connector hole and two traction wheel holesare horizontally opened on both of two opposite sides of the bottom ofthe box, respectively, the traction connector hole is used to connectthe traction connector and the box, the traction wheel hole is used toconnect the traction wheel and the box, and the two traction wheel holesare symmetrically distributed at two sides of the traction connectorhole.
 10. The modular shipping container according to claim 9, wherein:the box is formed by a top plate, a bottom plate, a front plate, a rearplate and two side plates, and the traction connector hole and thetraction wheel holes are opened at front and rear sides of the bottomplate.
 11. The modular shipping container according to claim 10,wherein: the bottom plate comprises a base plate and a bottom frame, theheight of the base plate is greater than the height of the bottom frame,and the traction connector hole and the traction wheel holes are openedon the bottom frame, respectively.
 12. The modular shipping containeraccording to claim 9, wherein: the traction connector comprises atubular connecting body and a fitting fastener thereof.
 13. The modularshipping container according to claim 9, wherein: the traction wheelcomprises an insertion stem, a central shaft and rollers, one end of theinsertion stem is fixed in the middle of the central shaft, and two endsof the central shaft are installed on the rollers, respectively.
 14. Amodular shipping container, comprising a box, wherein: the box isinstalled with a lock having an inward opening function; the lockcomprises a lock rod, a lock case handle connected to the lock rod, anda lock case base fixed on a door; the lock case handle is receivedinside the lock case base; a movable bolt and a pushing rod mechanismare provided inside the lock case base, the movable bolt comprises abolt cam, a bolt base, a bolt pin and a spring, the pushing rodmechanism comprises a pushing rod used to push the bolt cam to rotateand a mechanism used to push the pushing rod to move; the bolt cam hasan extension leg used to be connected to the pushing rod and a hook usedto prevent the lock case handle from being opened; the extension leg ofthe bolt cam is connected to the pushing rod, the bolt cam has a throughhole in the center, the bolt pin passes through the through hole of thebolt cam and the spring, and is fixed on the bolt base; one end of thespring is placed on the extension leg of the bolt cam, and the other endis positioned on the lock case base.
 15. The modular shipping containeraccording to claim 14, wherein: the mechanism used to push the pushingrod to move is a handle provided at an inner side of a door plate andconnected to the pushing rod.
 16. The modular shipping containeraccording to claim 14, wherein: the mechanism used to push the pushingrod to move is a knob or handwheel provided at an inner side of a doorplate and connected to the pushing rod, the pushing rod fits a shaftsleeve provided on the lock case base, the pushing rod has an externalscrew thread, and the shaft sleeve is provided with an internal screwthread.
 17. The modular shipping container according to claim 14,wherein: upper and lower ends of the lock rod pass through lock rodbrackets provided at positions near sides of the door plate,respectively, and are connected to upper and lower cylinders; the upperand lower cylinders are used to fit lock bases provided at upper andlower ends of a door frame, respectively.
 18. The modular shippingcontainer according to claim 17, wherein: the cylinder has a hook shapeand is fixed to the lock rod at a fixed angle, the lock base has arectangular box shape, and a semicircular fixing pin fitting thecylinder is provided inside the lock base.
 19. The modular shippingcontainer according to claim 14, wherein: a fixing bolt is furtherprovided inside the lock case base.
 20. The modular shipping containeraccording to claim 19, wherein: the lock case handle is formed of a tubecover, a central panel, and a lateral handle, the lock rod is fixedlyconnected to the lock case handle through the tube cover, the centralpanel is concave, on which rectangular holes fitting the sizes of thefixing bolt and the movable bolt are opened and a concave structureintersecting with the rectangular holes in a cross-like manner isprovided.